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use super::traits::ParseBytes;
use crate::{impl_name, result::SQLiteResult};
use core::ops::Deref;

/// # Suggested cache size (4 Bytes)
///
///  The 4-byte big-endian signed integer at offset 48 is the suggested cache
/// size in pages for the database file. The value is a suggestion only and
/// SQLite is under no obligation to honor it. The absolute value of the integer
/// is used as the suggested size. The suggested cache size can be set using the
/// default_cache_size pragma.
#[derive(Debug)]
pub struct SuggestedCacheSize(u32);

impl Deref for SuggestedCacheSize {
  type Target = u32;

  fn deref(&self) -> &Self::Target {
    &self.0
  }
}

impl_name! {SuggestedCacheSize}

impl ParseBytes for SuggestedCacheSize {
  const LENGTH_BYTES: usize = 4;

  fn parsing_handler(bytes: &[u8]) -> SQLiteResult<Self> {
    let buf: [u8; Self::LENGTH_BYTES] = bytes.try_into()?;

    let database_size = u32::from_be_bytes(buf);

    Ok(Self(database_size))
  }
}